Sycamore maple, Norway maple, Silver maple, wood engravings, published 1897 - stock illustration

Maple: 1) Sycamore maple (Acer pseudoplatanus), flowering branch, 1a) fertile hermaphrodite blossom, 1b) male blossom without calyx and petals, 1c) fruit, 1d) branch with buds; 2) Norway maple (Acer platanoides), branch with fruit, 2a) blossom; 3) Silver maple (Acer saccharinum, or Acer dasycarpum), 3a) fruit; 4) Ashleaf maple (Acer negundo), branch with fruits, 4a) branch with blossoms. Wood engravings, published in 1897.